Have a look at the attached for a couple of cars parked on the pavement first thing this morning. It was my understanding that you're not allowed to drive across any pavement where the kerb has not been dropped - the question here is about enforcement.
Is this one for the council or the police?
As for rush-hour bottlenecks, I just despair when I see the lack of consideration people (be it cab drivers, people picking train travellers up or just some of the folks passing through) display to one another.